Superconducting properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://

Michor, H.; Krendelsberger, R.; Hilscher, G.; Bauer, E. D.; Dusek, C.; Hauser, Robert G.; Naber, L.; Werner, Douglas H.; Rogl, P.; Zandbergen, H.W.

doi:10.1103/physrevb.54.9408

Cited by 44 publications

(18 citation statements)

References 35 publications

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“…2,3 Nickel-site substitutions on both the borocarbides and the boronitride revealed similar electronic properties of the bands related to the 3d electrons. 4 At a first glance, the thermodynamic properties of La 3 Ni 2 B 2 N 3Ϫ␦ seem to be close to the weak coupling BCS predictions, 5 but standard single-band BCS theory cannot explain the pronounced upward curvature of the upper critical field H c2 (T) close to T c . If applied to the borocarbides, it fails to describe both the thermodynamic properties and the upper critical field obtained from experiment.…”

Section: Introductionmentioning

confidence: 66%

Superconducting properties ofYxLu1−xNi
Manalo
¹
,
Michor
²
,
El-Hagary
³

et al. 2001
Phys. Rev. B
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40
4
26
1
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Specific heat and resistivity measurements were performed on polycrystalline samples of the solid-solution Y x Lu 1Ϫx Ni 2 B 2 C in order to determine thermodynamic properties such as the specific-heat difference ⌬C, the thermodynamic critical field H c (T), as well as the upper critical field H c2 (T). These properties were analyzed within the Eliashberg theory including anisotropy effects, yielding electron-phonon coupling anisotropy parameters ͗a k 2 ͘ ranging between 0.02 and 0.03 for the whole series, and Fermi velocity anisotropy parameters of ͗b k 2 ͘ϭ0.245-0.3. Excellent agreement between theory and experiment was achieved for these parameters, the Sommerfeld constant ␥ and model phonon spectra determined from specific heat measurements. An analysis of the previously investigated boronitride La 3 Ni 2 B 2 N 3Ϫ␦ for comparison revealed the electron-phonon anisotropy to be of great significance in describing its thermodynamic properties and the calculations yielded ͗a k 2 ͘ Ӎ0.08 and ͗b k 2 ͘Ӎ0.245. The T c behavior within the series Y x Lu 1Ϫx Ni 2 B 2 C is discussed in terms of the density of states at the Fermi level N(0).

show abstract

Section: Introductionmentioning

confidence: 66%

Superconducting properties ofYxLu1−xNi
Manalo
¹
,
Michor
²
,
El-Hagary
³

et al. 2001
Phys. Rev. B
Self Cite
40
4
26
1
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“…Our results confirm that for the investigated material the electron-phonon coupling is strong. Results predicted by the Bardeen-Cooper-Schrieffer theory (BCS) [35], [36] are presented with a dashed line [37].…”

Section: The Numerical and Analytical Resultsmentioning

confidence: 99%

Study of the superconducting phase in silicene under biaxial tensile strain

Durajski

Szczęśniak

Szczȩśniak

2014

Solid State Communications

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The electron-doped silicene under the influence of the biaxial tensile strain is predicted to be the phonon-mediated superconductor. By using the Eliashberg formalism, we investigate the thermodynamic properties of the superconducting silicene in the case when the tension is 5% and the electron doping equals 3.5 × 10 14 cm −2 . Under such conditions, silicene monolayer is expected to exhibit the highest superconducting transition temperature (TC ). In particular, based on the electron-phonon spectral function and assuming wide range of the Coulomb pseudopotential values (µ ∈ 0.1, 0.3 ) it is stated that the superconducting transition temperature decreases from 18.7 K to 11.6 K. Similar behavior is observed in the case of the zeroth temperature superconducting energy gap at the Fermi level: 2∆(0) ∈ 6.68, 3.88 meV. Other thermodynamic parameters differ from the predictions of the Bardeen-Cooper-Schrieffer theory. In particular, the ratio of the energy gap to the critical temperature changes in the range from 4.14 to 3.87. The ratio of the specific heat jump to the specific heat in the normal state takes the values from 2.19 to 2.05, and the ratio of the critical temperature and specific heat in the normal state to the thermodynamic critical field increases from 0.143 to 0.155. It is also determined that the maximum value of the electron effective mass equals 2.11 of the electron band mass.

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“…This analysis has been successfully applied to various metal-alloy superconductors, 61 and also to other recently discovered carbon-contained superconductors such as borocarbides 62,63 and MgCNi 3 . measured values extracted from the C p data are also plotted onto the empirical curves.…”

mentioning

confidence: 99%

Strong electron-phonon coupling in the rare-earth carbide superconductorLa2C3

Kim

Xie²,

Kremer³

et al. 2007

Phys. Rev. B

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We present the results of a crystal structure determination using neutron powder diffraction as well as the superconducting properties of the rare-earth sesquicarbide La2C3 (Tc ≈ 13.4 K) by means of specific heat and upper critical field measurements. From the detailed analysis of the specific heat and a comparison with ab-initio electronic structure calculations, a quantitative estimate of the electron-phonon coupling strength and the logarithmic average phonon frequency is made. The electron-phonon coupling constant is determined to λ ph ∼ 1.35. The electron-phonon coupling to low energy phonon modes is found to be the leading mechanism for the superconductivity. Our results suggest that La2C3 is in the strong coupling regime, and the relevant phonon modes are Larelated rather than C-C stretching modes. The upper critical field shows a clear enhancement with respect to the Werthamer-Helfand-Hohenberg prediction, consistent with strong electron-phonon coupling. Possible effects on the superconducting properties due to the non-centrosymmetry of the crystal structure are discussed.

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Superconducting properties ofLa3Ni2
H. Michor
¹
,
R. Krendelsberger
²
,
G. Hilscher
³

et al.

Cited by 44 publications

References 35 publications

Superconducting properties ofYxLu1−xNi
Manalo
¹
,
Michor
²
,
El-Hagary
³

et al. 2001
Phys. Rev. B
Self Cite
40
4
26
1
View full text Add to dashboard Cite

Superconducting properties ofYxLu1−xNi
Manalo
¹
,
Michor
²
,
El-Hagary
³

et al. 2001
Phys. Rev. B
Self Cite
40
4
26
1
View full text Add to dashboard Cite

Study of the superconducting phase in silicene under biaxial tensile strain

Strong electron-phonon coupling in the rare-earth carbide superconductorLa2C3

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Superconducting properties ofLa3Ni2H. Michor1, R. Krendelsberger2, G. Hilscher3 et al.

Cited by 44 publications

References 35 publications

Superconducting properties ofYxLu1−xNiManalo1, Michor2, El-Hagary3 et al. 2001Phys. Rev. BSelf Cite404261View full textAdd to dashboardCite

Superconducting properties ofYxLu1−xNiManalo1, Michor2, El-Hagary3 et al. 2001Phys. Rev. BSelf Cite404261View full textAdd to dashboardCite

Study of the superconducting phase in silicene under biaxial tensile strain

Strong electron-phonon coupling in the rare-earth carbide superconductorLa2C3

Contact Info

Product

Resources

About

Superconducting properties ofLa3Ni2
H. Michor
¹
,
R. Krendelsberger
²
,
G. Hilscher
³

et al.

Superconducting properties ofYxLu1−xNi
Manalo
¹
,
Michor
²
,
El-Hagary
³

et al. 2001
Phys. Rev. B
Self Cite
40
4
26
1
View full text Add to dashboard Cite

Superconducting properties ofYxLu1−xNi
Manalo
¹
,
Michor
²
,
El-Hagary
³

et al. 2001
Phys. Rev. B
Self Cite
40
4
26
1
View full text Add to dashboard Cite